From the Centers for Disease Control. Postponed childbearing--United States, 1970-1987.
D000293:Adolescent; D000328:Adult; D001722:Birth Order; D001723:Birth Rate; D005260:Female; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D012959:Socioeconomic Factors; D014481:United States